BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	nation,
	o_year,
	sum(amount) as sum_profit
from
	(
		select
			n_name as nation,
			extract(year from o_orderdate) as o_year,
			l_extendedprice * (1 - l_discount) - ps_supplycost * l_quantity as amount
		from
			part,
			supplier,
			lineitem,
			partsupp,
			orders,
			nation
		where
			s_suppkey = l_suppkey
			and ps_suppkey = l_suppkey
			and ps_partkey = l_partkey
			and p_partkey = l_partkey
			and o_orderkey = l_orderkey
			and s_nationkey = n_nationkey
			and p_name like '%goldenrod%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                           QUERY PLAN                                                                                            
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=1183450.14..1183454.65 rows=129 width=46) (actual time=127615.856..130551.142 rows=175 loops=1)
   Group Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
   Buffers: shared hit=35307604 read=2438748 dirtied=13484 written=16983
   ->  Sort  (cost=1183450.14..1183450.46 rows=129 width=46) (actual time=127604.571..128453.003 rows=3242643 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 554301kB
         Buffers: shared hit=35307604 read=2438748 dirtied=13484 written=16983
         ->  Hash Join  (cost=66851.14..1183445.62 rows=129 width=46) (actual time=1163.288..115186.118 rows=3242643 loops=1)
               Hash Cond: (supplier.s_nationkey = nation.n_nationkey)
               Buffers: shared hit=35307596 read=2438748 dirtied=13484 written=16983
               ->  Nested Loop  (cost=66849.58..1183441.64 rows=129 width=24) (actual time=1163.204..111706.400 rows=3242643 loops=1)
                     Buffers: shared hit=35307592 read=2438748 dirtied=13484 written=16983
                     ->  Nested Loop  (cost=66849.15..1183379.11 rows=129 width=24) (actual time=1163.105..57718.904 rows=3242643 loops=1)
                           Buffers: shared hit=23132435 read=1625491 dirtied=13141 written=10661
                           ->  Nested Loop  (cost=66848.85..1183337.49 rows=129 width=28) (actual time=1163.093..44521.410 rows=3242643 loops=1)
                                 Buffers: shared hit=13387235 read=1625491 dirtied=13141 written=10661
                                 ->  Hash Join  (cost=66848.29..352050.41 rows=424412 width=16) (actual time=1163.045..6546.396 rows=432552 loops=1)
                                       Hash Cond: (partsupp.ps_partkey = part.p_partkey)
                                       Buffers: shared hit=68572 read=142908 written=870
                                       ->  Seq Scan on partsupp  (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.008..2921.647 rows=8000000 loops=1)
                                             Buffers: shared hit=59238 read=111720 written=809
                                       ->  Hash  (cost=65522.00..65522.00 rows=106103 width=4) (actual time=1162.273..1162.273 rows=108138 loops=1)
                                             Buckets: 131072  Batches: 1  Memory Usage: 4826kB
                                             Buffers: shared hit=9334 read=31188 written=61
                                             ->  Seq Scan on part  (cost=0.00..65522.00 rows=106103 width=4) (actual time=0.018..1115.749 rows=108138 loops=1)
                                                   Filter: ((p_name)::text ~~ '%goldenrod%'::text)
                                                   Rows Removed by Filter: 1891862
                                                   Buffers: shared hit=9334 read=31188 written=61
                                 ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.56..1.95 rows=1 width=24) (actual time=0.017..0.085 rows=7 loops=432552)
                                       Index Cond: (l_partkey = partsupp.ps_partkey)
                                       Filter: (partsupp.ps_suppkey = l_suppkey)
                                       Rows Removed by Filter: 22
                                       Buffers: shared hit=13318663 read=1482583 dirtied=13141 written=9791
                           ->  Index Scan using pk_supplier on supplier  (cost=0.29..0.31 rows=1 width=8) (actual time=0.003..0.003 rows=1 loops=3242643)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9745200
                     ->  Index Only Scan using orders_o_orderkey_o_orderdate_idx on orders  (cost=0.43..0.47 rows=1 width=8) (actual time=0.015..0.016 rows=1 loops=3242643)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Heap Fetches: 3242643
                           Buffers: shared hit=12175157 read=813257 dirtied=343 written=6322
               ->  Hash  (cost=1.25..1.25 rows=25 width=30) (actual time=0.022..0.022 rows=25 loops=1)
                     Buckets: 1024  Batches: 1  Memory Usage: 10kB
                     Buffers: shared hit=1
                     ->  Seq Scan on nation  (cost=0.00..1.25 rows=25 width=30) (actual time=0.006..0.010 rows=25 loops=1)
                           Buffers: shared hit=1
 Planning time: 33.021 ms
 Execution time: 130604.978 ms
(47 rows)

COMMIT;
COMMIT